[Intel-gfx] [PATCH 4/4] drm/i915: fix link rates reported for SKL

[Jani Nikula]

On Tue, 18 Aug 2015, Sivakumar Thulasimani <sivakumar.thulasimani at intel.com> wrote:
> From: "Thulasimani,Sivakumar" <sivakumar.thulasimani at intel.com>
>
> This patch fixes the bug that SKL SKUs before B0 might return
> HBR2 as supported even though it is not supposed to be enabled
> on such platforms.
>
> v2: optimize if else condition (Jani)
>
> Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Signed-off-by: Sivakumar Thulasimani <sivakumar.thulasimani at intel.com>

Pushed to drm-intel-next-fixes, thanks for the patch and review.

BR,
Jani.


> ---
>  drivers/gpu/drm/i915/intel_dp.c |   19 +++++++++++--------
>  1 file changed, 11 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 8bc6361..32bf961 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -1224,21 +1224,24 @@ static bool intel_dp_source_supports_hbr2(struct drm_device *dev)
>  static int
>  intel_dp_source_rates(struct drm_device *dev, const int **source_rates)
>  {
> +	int size;
> +
>  	if (IS_BROXTON(dev)) {
>  		*source_rates = bxt_rates;
> -		return ARRAY_SIZE(bxt_rates);
> +		size =  ARRAY_SIZE(bxt_rates);
>  	} else if (IS_SKYLAKE(dev)) {
>  		*source_rates = skl_rates;
> -		return ARRAY_SIZE(skl_rates);
> +		size = ARRAY_SIZE(skl_rates);
> +	} else {
> +		*source_rates = default_rates;
> +		size = ARRAY_SIZE(default_rates);
>  	}
>  
> -	*source_rates = default_rates;
> -
>  	/* This depends on the fact that 5.4 is last value in the array */
> -	if (intel_dp_source_supports_hbr2(dev))
> -		return (DP_LINK_BW_5_4 >> 3) + 1;
> -	else
> -		return (DP_LINK_BW_2_7 >> 3) + 1;
> +	if (!intel_dp_source_supports_hbr2(dev))
> +		size--;
> +
> +	return size;
>  }
>  
>  static void
> -- 
> 1.7.9.5
>

-- 
Jani Nikula, Intel Open Source Technology Center